Windmill-spring



NiTED STATES PATENT rricnl OLIVER H. WALLEN, OF MARSHALLTOW N, IOWA.

WlNDMlLL-SPRING.

SPECIFICATION forming part of Letters Patent No. 548,484, dated. October22, 1895.

Application filed April 16, 1895. Serial No. 545,980- (No model.)

which the following is a specification.

The object of my invention is to make a windmill spring which will doaway with the sudden jerk in the pump-rod produced by the windmill-crankas it passes from a downward to an upward or upward to a downward strokein both the up and down strokes.

Figure l of the accompanying drawings is a vertical section of theentire wind millspring, showing the two castings M and N with theirhelical proj ecting bosses p, t, 'v, and u. S is the coil-springsurrounding the two castings M and N. Fig. 2 is a front view, showingthe appearance and shape of the two 4 castings and bosses.

Similar letters refer to similar parts in both figures.

The pump-rod passes through the center of the spring, and beingvertically under the mill-rod the line of action of the resultant forcein the mill-rod and that in the pump-rod will lie and act in' the samevertical line, the center line of the spring, and have therefore adirect central pull.

iVith these objects in view the mechanism constructed consists of aspring S and two castings M and N, Fig. 1, each of which occupiesone-half of the inside of the spring. '12 and u are two spiral bosses onthe casting N. p and t are two spiral bosses on M, having the same pitchas the spring, as can be seen in Fig. 2.

The method of construction is as follows: One of the two castings isfirst slipped through the spring into its place. The other casting isthen started at one end and screwed in by turning both castings. The onein place simply turns around in its position. It is now ready to be puton the mill. The upper end of the pump-rod passes through the hole toand centrally through the spring, being fastened by a pin through Z. Thelower end of the mill-rod is suitably fastened to the upper 'end of thewindmill-spring and is centrally located with respect to the spring,thus giving us a direct central pull and thrust in the upward anddownward strokes, respectively. Vhen the mill-rod begins its upwardstroke the casting M pulls up suddenly. Ntending to remain in itsoriginal position, the spring is consequently compressed by the actionof the two bosses p and a, and the sudden jerk is thus overcome.Similarly in the beginning of the downward stroke the spring iscompressed by the action of the bosses at and t, and the sudden jerk isagain overcome, thus making a double-acting wind mill-spring, and may beused on a double as well as a single acting pump.

I-Iavingthus explained my invention, what I claim as new, and desire tosecure by Letters Patent, is

A rod connection comprising two similar castings, each provided with asemi-cylindrical extension, helical projecting bosses at the top andbottom of said extensions, and a coil spring interposed between theaforesaid bosses and encircling both of the extensions, as described inthe foregoing specification.

OLIVER H. WALLEN, Witnesses:

CHAS. GLicK, MARGARET EsrEL.

